From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: Failed RAID6 Date: Sat, 25 Feb 2012 07:52:26 +1100 Message-ID: <20120225075226.54c42fb2@notabene.brown> References: <1788692158.60895.1330105517283.JavaMail.root@zimbra.cis.uab.edu> <1217710129.60911.1330106199149.JavaMail.root@zimbra.cis.uab.edu> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/Yg/b2OtIc+VvAXzOk4.cJN."; protocol="application/pgp-signature" Return-path: In-Reply-To: <1217710129.60911.1330106199149.JavaMail.root@zimbra.cis.uab.edu> Sender: linux-raid-owner@vger.kernel.org To: Larry Owen Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids --Sig_/Yg/b2OtIc+VvAXzOk4.cJN. Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Fri, 24 Feb 2012 11:56:39 -0600 (CST) Larry Owen wrote: > We have a raid6 array with 3 "failed" discs. However, smart=20 > status for all drives is ok. I'm also not seeing any io errors > in my logs (except when the discs were initially dropped). I=20 > also tried reading raw data from one of the failed drives,=20 > using dd. I was able to get data, still no io errors. >=20 > We're thinking about trying to re-add or assemble --force, > in hopes of getting it up to recover some data (did I mention > the users put important data on here knowing it was not backed > up). >=20 > Our main concern is that we add the discs and the system start=20 > rebuilding. Any suggestions on how we should proceed? Use assemble --force - this situation is exactly what it is for. mdadm -S /dev/md0 mdadm -A --force /dev/md0 You might need to list all the component devices, depending on what is in your mdadm.conf NeilBrown >=20 > Thanks, > Larry Owen >=20 > ################### MDADM OUTPUT ############################## >=20 > mdadm --detail /dev/md0=20 > /dev/md0: > Version : 1.2 > Creation Time : Tue Feb 1 16:25:03 2011 > Raid Level : raid6 > Used Dev Size : 1953512960 (1863.02 GiB 2000.40 GB) > Raid Devices : 22 > Total Devices : 21 > Persistence : Superblock is persistent >=20 > Update Time : Wed Feb 22 23:42:11 2012 > State : active, FAILED, Not Started > Active Devices : 19 > Working Devices : 21 > Failed Devices : 0 > Spare Devices : 2 >=20 > Layout : left-symmetric > Chunk Size : 512K >=20 > Name : kddm-nas:0 (local to host kddm-nas) > UUID : 9fc31e38:7723974a:1f37af62:5a75ec91 > Events : 5412 >=20 > Number Major Minor RaidDevice State > 0 8 16 0 active sync /dev/sdb > 1 8 32 1 active sync /dev/sdc > 2 8 48 2 active sync /dev/sdd > 3 8 64 3 active sync /dev/sde > 4 8 80 4 active sync /dev/sdf > 5 8 96 5 active sync /dev/sdg > 6 8 112 6 active sync /dev/sdh > 7 0 0 7 removed > 8 8 144 8 active sync /dev/sdj > 9 8 160 9 active sync /dev/sdk > 10 8 176 10 active sync /dev/sdl > 11 0 0 11 removed > 12 8 208 12 active sync /dev/sdn > 13 8 224 13 active sync /dev/sdo > 14 8 240 14 active sync /dev/sdp > 15 0 0 15 removed > 16 65 16 16 active sync /dev/sdr > 17 65 32 17 active sync /dev/sds > 18 65 48 18 active sync /dev/sdt > 19 65 64 19 active sync /dev/sdu > 20 65 80 20 active sync /dev/sdv > 21 65 96 21 active sync /dev/sdw >=20 > 22 65 112 - spare /dev/sdx > 23 65 128 - spare /dev/sdy >=20 >=20 >=20 > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html --Sig_/Yg/b2OtIc+VvAXzOk4.cJN. Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iQIVAwUBT0f4ijnsnt1WYoG5AQLYXRAAkeSpO9F7ET1XilJx0oNmfTWA6BoDhj1x cI93KTyMDbBtEfj8zdmi0uGiseU+h/XxoqoSAtWmxA/5E5UPWc13Kmv4/H38mBeC i6VsEB0uj4evTYraQnLbau+z2ha4HMXxlTfG30Y1IIODUbInbZdvSm3fwx/B2Iuc dztz2t15qwFzwM7ESH/eHksT8IgW8aOYCb23hW98QEoUfBJsffi+Rp7/j+dwtMhr NT7RcULtc2yJNZjfDsAQv6XrlBzjvltQxqtCs5w9Z+R3n7mDkVl/v+xWFzMpLdmN t+Dr/+ww+c7P8sNm5OrxYdB8k9oo4vip/LZoA9I/dvCWwoo4pcxPjwMAsC/+1Spn AGnA9qHlNI0RWqaqFRevIcgoW0qimRSUSaInLUf/+0u7WP8XeS7+KsknKNcjsV/A MqLi+9XtShAIPhqRaHu46/DGFKOTRxCgqGWb+TOzV/PSG4jcmzw02ygENwFgqQwu T3fB6e0GHh8TyQmq7GrpSYv7+JIbLDPN7O2XM4a+jK+EigumqkCbnjIsuKfLYXL3 dCH8ryApmVElewaSULdH7mZE0ShaH3vgKM4edyOrhLBeN4E/U8xByO8G0I+ioDlJ JRnKs07Ao0I4w2kHAdUdI4VNUkDl11OdmrvYZzPLnNxLKAsPTOfWwsagvsiTOc0i Ne9QAWHvOVU= =R7dc -----END PGP SIGNATURE----- --Sig_/Yg/b2OtIc+VvAXzOk4.cJN.--